·High carbon high vanadium HSS is used，high concentration of vanadium carbide hard addition,more wear-resistant.

·With the deep cryogenic treatment,it obtained dispersion strengthing,45°bend without yieding.

·Grinding adopts the process of first rough machinning and then fine machining,so that it can guarantee precision and depth of parallelism.

·The package is adopted gas phase anticorrosive paper,rust protection is more thorough and lasts longer.